Recovery of phenolic compounds through the decomposition of lignin in near and supercritical water
Recovery of phenolic compounds through the decomposition of lignin in near and supercritical water
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DOI：
10.1016/j.cep.2007.09.001
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发表时间：
2008-09-01
影响因子：
4.3
通讯作者：
Goto, Motonobu
中科院分区：
文献类型：
--
作者：
Wahyudiono;Sasaki, Mitsuru;Goto, Motonobu
木质素作为木材生物质的一部分，已被认为是一种工业应用的替代化合物来源。用间歇式反应器研究了木质素在623和673K的近临界和超临界水中的降解。将温度和反应时间的影响组合成一个单一的严重程度参数，用于监测木质素降解为液体馏分的过程。在相同条件下，随着反应时间的延长，高相对分子质量组分减少，低相对分子质量组分增加。采用JASCO MD-2010 Plus高效液相色谱仪和傅里叶变换红外光谱仪分别对液体产物和固体残留物(焦炭)中的化学形态进行分析。甲醇可溶部分的主要产物为邻苯二酚(28.37 wt%)、苯酚(7.53 wt%)、间对甲酚(7.87 wt%)和邻甲酚(3.80 wt%)。根据实验结果，提出了木质素降解的反应机理。下一步，可以探索高产量有价值的化学品的最佳操作条件。(C)2007 Elsevier B.V.保留所有权利。
Lignin as a part of wood biomass has been proposed to be an alternative source of chemical compounds for industrial applications. The degradation of lignin was studied in near and supercritical water at temperatures 623 and 673 K using a batch type reactor. The effects of temperature and reaction time were combined into a single severity parameter that was used to monitor the degradation of lignin to liquid fraction. With an increase in the reaction time at the same conditions, higher molecular weight fractions decreased and the amount of lower molecular weight fractions increased. The chemical species in liquid products and solid residues (char) were analyzed using high performance liquid chromatography with a Jasco MD-2010 Plus and Fourier transform infrared spectrophotometer, respectively. The main products in methanol soluble fraction were catechol (28.37 wt%), phenol (7.53 wt%), m,p-cresol (7.87 wt%) and o-cresol (3.80 wt%). Based on the experimental results, a reaction mechanism for the degradation of lignin was proposed. Next, optimum-operating conditions for high yields of valuable chemicals could be explored. (C) 2007 Elsevier B.V. All rights reserved.